Telephone instrument.



W. F. TAYLOR & V'. DURBIN.

TELEPHONE INSTRUMENT. APPLICATION FILED MAY 17, 1909. V I '1,010,531 YPatented Dec.5, 1911.

2 SHEETS-SHEET 1.

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y TELEPHONE INSTRUMENT.

` APPLICATION FILED MAY 17, 1909. 1,010,531, Patented 119115, 1911.

` 2 SHEETS-SHEET 2.

COLUMBIA PLANDURAPM co.,wASMINuTN. D. c.

engaging the contacts connected with they UNTTED sTATEs PATENT oEEroE.

'WALTER F. TAYLOR AND VERNON DURBIN, OF BROOKLINE, MASSACHUSETTS,ASSIGN- ORSTO HOLTZER-CABOT ELECTRIC COMPANY, A CORPORATION OEMASSACHUSETTS.

TELEPHONE INSTRUMENT.

Specication of Letters Patent.

Patented Dee. 5,1911.

Application sied May 17,1909; serial No. 499,496.

companying drawings, is a specification, like' letters on the drawingsrepresenting like parts.

Thepresent invention relates to a telephone desk instrument and isembodied in a novel construction and arrangement, the

principal purpose of which is to facilitate in-` spection and repairs.

In accordance with the invention, thein-1 strument is made of threeprincipal parts,

viz., the base or standard, the transmitter member, which supports thetransmitter and 'the switch hook on which the receiver is hung, and aninclosing shell which covers the leading-in wires and the contacts.

The base portion receives the leading-in wires which are connected to aseries of spring contacts mounted on an upright support extending upwardfrom the base, and the transmitter portion is provided with two springcontacts which are connected with the wires leading to the transmitterand are arranged to be engaged by theswitch hook when the receiver' ison the hook, and disengaged therefrom when the` receiver is taken down.

The upper or transmitter portion is provided with a sleeve which isadapted tofit over the lowerv portion, the springs carried by the upperportion then engaging ory disleading in wires so as to close thesignaling circuit when the receiver 1s hung up, andto close thetelephone circuit when the receiver` is taken down in the usual way.

rIhe inclosing portion consists of a'tubular member adapted to inclose.the two parts above described, and a cap at the bottom of the tubular`member which covers the extended portion of the base.

When the instrument is assembled the parts are held together by a singlescrew which extends through the inclosing member into the two portionsof the transmit-ter` member' within. Upon removing the screw,

vthe transmitter member can be lifted out of the inclosing portion, theinclosing portion then removed, and the other parts put together againwithout the inclosing member, so that the instrument is in workingcondition; whereby it can be much more readily inspected than is thecase with the ordinary instrument which has to be completely dismantledto gain access to the circuit connections.v

Figure l is a vert-ical section of an instrument embodyingthe'invention, showing in dotted lines the position of the uppermemcondition; Fig. 3 1s a similar view, showing the parts in a differentposition; Fig. 4 is a section showing the several parts of theinstrument with lthe transmitter member removed and the other partsassembled; Fig. 5 is a horizontal section on line v5 of Fig. 4; andFig.. 6 is a horizontal section on line m6 of Fig. 4.

VThe base a receives the leading-in wires b through a sleeve ofinsulating material b2, the

said leading-in wiresbeing connected with the binding posts c which, inturn, are connected through wires b3 with a series of spring contactscZcZ2, als and 034. The said contacts are so arranged that they tend tospread apart, the contacts d and d3, however,

which close the signaling circuit being reversed as to their contactsides, so that when left to themselves they remain in contact keepingthe signaling circuit closed, (see Fig. 4). The contact springs arearranged side by side, so that if the two outer springs are .pressedtoward each other, they bring all the springs into contact with theexception of the springs al and d3 which are separated on account of thereversing of the contact surfaces. The upper member A carries thetransmitter e and receiver hook f, the latterv being pivotally supportedbetween two pieces of sheet metal f2 which have two downwardly extendingportions f3 to hold the pivot f4 on which the receiver hook f ismounted; and two other forked extensions f5 to which are connected theContact springs f6 which are in electrical contact lwith the conductorsf7 which lead to the transmitter. When the upper and lower members A andB, respectively, are together, the spring members f6', if left free,engage the outer contact springs d and d, closing the circuits with theexception of the signaling circuit.

The contact springs f6, which tend to meet `ber when it has beenremoved; Fig. 2 is a secv n tion, taken at right angles to Fig. 1, withthe vinclosing case removed, and the other parts ,restored to theirworkin at the upper end, are provided with outturned portions f6 whichlie directly below an insulated engaging member f8 movable with thereceiver hook f, so that when the weight of the receiver depresses thesaid hook it will separate the springs f6, thus allowing the othercontacts to separate, as shown in F ig. 2, the signaling contacts CZ andcl3, however, then being in engagement. The instrument is thus incondition to receive signals, and upon the removal of the receiver fromthe hook the projection f8 will rise, thus permitting the springs f tocome together, closing the telephone circuit-s and opening the signalingcircuit, as best shown in F ig. 3.

In the construction shown, the receiver hook f is provided at the rearend with a downwardly extending arm f through which extends the pivot f4between the extended portions f3 of the sheet metal pieces f2. Theinsulated engaging portion f8 is secured to the part fo and projectsforward therefrom so as to move up and down with relation to the contactsprings f as the receiver hook rocks on its pivot. A spring flo isarranged to act on the receiver hook f to move the outer end thereofupward when the weight of the receiver has been removed. This uppermember is arranged to be connected with the lower member by a slidingmovement, and to be securely supported thereon when in position.

The lower member B consist-s of a flat plate (Z5 properly secured to thebase a, and extending upward therefrom, the spring contacts being heldon a bracket Z6 secured to said plate, the springs being separated byinsulating material and clamped to the side of the bracket Z6 by meansof a clamping plate (Z7. The plate d5 extends upward above the ends ofthe contact springs and is provided with a notch ZS above which areformed two shoulders do, the notch serving to receive the switch hook fwhile the shoulders engage the plates f2 between the extensions f3 andthe extensions f5. The space between these extensions f3 and f5 issubstantially equal to the thickness of the plate d5, so that as the twoparts slide together they lit and form an adequate mutual support. As anadditional supporting means, however, the extensions f5 at the lower endare connected by means of a half round shell g which is secured to thesides of the extensions, the width of the plate (Z5 being substantiallyequal to the width of the shell g which, therefore, serves to hold theplate flat against the sides of the extensions.

The inclosing shell for the instrument consists of a metallic tubularportion 7L extending upward from an extended cap por tion it? which fitsover the base a and covers the leading-in wires Z) and theirconnections, the tubular portion k surrounding the contact springs. Thetubular portion t is shown as covered with an outer shell h3 which maybe of hard rubber or gutta percha, the said shell being substantiallythe same in diameter as that of a downwardly projecting cap e2 at therear of the receiver e. The metallic shell t projects upward above theouter portion h3 and is adapted to fit into the cap e2 so that when theinstrument is assembled, the interior is fully protected and the outsideis free from any apparent joints. The part g which is connected with theprojections f5 is curved so as to conform to the interior of the tube7L, and the contact springs f6 which are secured to the inner sides ofthe arms f5 are shown as connected by means of a bowshaped member z'which projects substantially into contact with the other side of theportion h, thus giving a support for the interior part at oppositesides. This construction, moreover, serves to keep the parts f5 in theiroriginal position and prevents them from spreading, or being sprungtogether.

sembled, the parts may be fastened by means of a screw 76 which extendsthrough the side of the member 71, and the shell g and is screwed intothe plate d5. This holds t-he parts all firmly together, and, at thesame time, if it is necessary to inspect the connections, or to take theinstrument apart for repairs, it is necessary only to remove the screw7s, after which the upper portion A can be pulled out endwise, as shownin dotted lines, F ig. 1, and the inclosing portion lifted 0E. Then, ifit is desired, the upper and lower parts, as shown in Fig. 2, can be puttogether without the inclosing portion, so that the instrument is in itsoriginal operative condition, but with all the connections and contactsexposed.

Claims:

l. In a telephone instrument a base provided with leading in wires andspring contacts; an upright support mounted on said base; a transmitterportion provided with a transmitter and a gravity hook for the receiver,said transmitter portion being removably secured on said upright; springcontacts for the transmitter conductors adapted to engage the springcontacts on the base; and an inclosing case independent of said base andsupport.

2. 1n a telephone instrument a base provided with leading' in wires andspring contacts; an upright support mounted on said base; a transmitterportion provided with a transmitter and a gravity hook for the receiver,said transmitter portion being removably secured on said upright; springcontacts for the transmitter conductors adapted to engage the springcontacts on the base; and an inclosing sleeve independentof said baseand transmitter portion.

After the instrument is fully as- 3. In a telephone instrument a baseprovided With leading in wires and spring contacts; an upright supportmounted on said base; a transmitter portion provided with a transmitterand a gravity hook for the receiver, said transmitter portion beingremovably secured on said upright; spring contacts for the transmitterconductors adapted to engage the spring contacts on the base aninclosing sleeve-independent of said base and transmitter portion; and afastening device accessible from the outside,` for said inclosingsleeve, base and transmitter portion.

4L. A telephone instrument having a base or support and a transmittersupported thereby, but separable therefrom; spring contactsconstitut-ing means for automatically completing the circuits throughthe instrument when said transmitter is supported upon said base` orsupport; an inclo'sing sleeve independent of the-base and thetransmitter but adapted to be held Vin'position between said base andtransmitter; and a single fastening device extending through saidinclosing sleeve into engagement With the parts Within.

5. A telephone instrument having a base with a central vertical support;leading in Wires connected With said support; spring contacts connectedWith said leading in Wires and mounted on said vertical support, saidcont-acts being so associated as normally to open the talking circuitand close the signaling circuit; a transmitter member having a sleeveconnection With said vertical support; spring contacts mounted in saidtransmitter member, said spring contacts being electrically connectedwith the transmitter terminals and arranged t-o make electric-al contactWith the spring contacts of the leading in Wires of the transmittercircuit and also to separate the signaling terminals by spring pressure;and a receiver hook adapted to act on the spring contacts mounted in thetransmitter member and retain them out of engagement With the othercontacts yWhen the receiver is on the hook.

In testimony whereof, We have signed our names to this specification inthe presence of two subscribing Witnesses.

WV ALTER F. TAYLOR. VERNON DURBIN. Witnesses:

M. E. CovENEY, JAS. J. MALONEY.

Copies of this patent may be obtained for ve cents each, by addressingthe Commissioner of Patents, Washington, D. C.

